diff --git a/control-plane/api-gateway/binding/validation_test.go b/control-plane/api-gateway/binding/validation_test.go
index 71d2a03bca..2e70415e42 100644
--- a/control-plane/api-gateway/binding/validation_test.go
+++ b/control-plane/api-gateway/binding/validation_test.go
@@ -565,6 +565,14 @@ func TestValidateListeners(t *testing.T) {
 			expectedAcceptedErr: errListenerPortUnavailable,
 		},
 		"conflicted port": {
+			listeners: []gwv1beta1.Listener{
+				{Protocol: gwv1beta1.TCPProtocolType, Port: 80},
+				{Protocol: gwv1beta1.TCPProtocolType, Port: 80},
+			},
+			expectedAcceptedErr: errListenerPortUnavailable,
+			listenerIndexToTest: 1,
+		},
+		"conflicted mapped port": {
 			listeners: []gwv1beta1.Listener{
 				{Protocol: gwv1beta1.TCPProtocolType, Port: 80},
 				{Protocol: gwv1beta1.TCPProtocolType, Port: 2080},